Ramification in Higher Algebra

Wednesday, August 3, 2022 - 3:00pm - 3:45pm
John Berman (University of Massachusetts)
I will review the theory of ramification in number theory and then show that being totally ramified or unramified is equivalent to a natural condition in higher algebra. This leads to a much simplified calculation of THH of a ring of integers in a number field, relying on ramified descent (a kind of weaker etale descent).